Arrangement consisting of a plurality of mechanically coupled rotating coil variometers



2,270,178 CHANICALLY Jan. 13, 1942.

A. WEIS ET AL ARRANGEMENT CONSISTING OF A PLURALITY OF ME COUPLED ROTATING COIL VARIOMETERS Filed July 10 1940 INVENTORS F WE/S 8 A'F'TRNW Patented Jan. 13, 1942 UNITED STATES PATENT ()FFICE ARRANGEMENT CONSISTING OF A PLURAL- ITY OF MECHANICALLY COUPLED ROTAT- ING COIL VARIOMETERS corporation of Germany Application July .10, 1940, Serial No. 344,714 In Germany June 3, 1939 4 Claims.

This invention relates to an arrangement consisting of various mechanically coupled rotating coil variometers having coils which may be adjusted in relation to one another and in which both the core of the stator and that of the rotor consist of magnetizable material.

It has already been proposed to efiect a mechanical adjustment of the magnetizable core of the stator by providing recesses in the magnetizable core or to arrange in such recesses pins capable of being adjusted. However, both methods are relatively complicated and therefore not suitable for a production of rotating coil variometers on a large scale. It has further been proposed to shift the magnetizable core of the stator axially with respect to the rotor. In this manner the coupling of the winding is changed, which, however, as results from the operation of the variometer influences to a considerable extent the characteristic curve or the inductance curve only towards the end of the mechanical adjusting range of the variometers, the change in the zero position being, however, smaller and that in the 180 position greater. Finally, it has already been proposed to design the magnetizable core of the stator of a plurality of sections and to adjust these sections with respect to one another in such a manner as to provide an air gap between any two sections. However, in this case, there results a change of leakage in the mag netic circuit of the stator, otherwise the displacements as to the inductance curve being the same as described above.

The object of the present invention is to provide an arrangement, whereby the curves graphically representing the variations of inductance of the rotating coil variometers are brought into agreement with one another in accordance with the angle of rotation, i. e., particularly also in the central portion of the mechanical adjusting range of the variometer arrangement. This may be accomplished according to the invention by providing a device for varying the individual inductance Values in the end positions of the mechanical adjusting range and a device for varying independently the adjustment of the inductance of the individual variometers to a great extent With respect to the other inductances in the central portion of the mechanical adjusting range. A possibility of shifting the ends of the inductance curves consists according to the invention in axially adjusting the core of the stator and that of the rotor of each variometer in relation to one another, 1. e., either in adjusting only the cores or the cores and the coils, whereas the central portions of the inductance curves may preferably be shifted in the manner that the cores of the rotors and stators of each variometer together with the coils or only the coils are adjusted with respect to one another in the direction of rotation. In carrying the invention into practice it is immaterial whether the rotor or the stator or their cores are adjustable, while the stator or the rotor or their cores remain at rest when bringing the inductance curves into agreement with one another. Consequently, the part employed for bringing the inductance curves into agreement with one another may be adjusted in both directions, i. e., in the axial direction as well as in the direction of rotation either only with the aid of the core of the rotor or with the core of the stator or the inductance curves may be brought into agreement with one another either by adjusting the rotor or one of its components or by adjusting the stator or one of its components of each variometer. An adjustment in the axial direction and in the direction of rotation of the stator has proved particularly advantageous, since the agreement of the inductance may be brought about in a simple manner exteriorly of the arrangement.

As already described above an agreement of the inductance curve in the end positions of the mechanical adjusting range is brought about by varying the coupling of the coils. By adjusting each variometer in accordance with the angle of rotation it is possible to attain an agreement of the curve of each variometer in the central portion of the mechanical adjusting range. In this case a great advantage is attained, since in the central portion in which the axis of the stator coil is perpendicular to that of the rotor core, the coupling is smallest and the characteristic curve of each variometer presents the greatest steepness owing to the change in inductance dependent upon the angle of rotation so that very slight adjustments bring about an agreement of the characteristic curves at this point.

Notwithstanding the above there may be certain cases where the ends and the beginnings of the curves cannot be brought into agreement with one another. In such cases an arrangement which permits an adjustment of small values of the inductance of each variometer may be designed according to the invention by employing a small additional inductance capable of being adjusted and which is connected in series with the variometer coils capable of being adjusted with respect to one another. The additional inductance may be varied in a known manner, for instance, by adjusting a magnetiz able body.

If a rotor is employed as an adjustable member it may be naturally so arranged that the rotor may be adjusted on the shaft 01' on the common shaft of the variometer in the axial direction or in the direction of rotation. To adjust the stator or its parts for the purpose of bringing the inductance curves into agreement with one another the stator is preferably arranged in a separate casing which serves as a guide for the axial shift and/or the shift of the stator in the direction of rotation. This casing in turn may be so movably mounted as to permit an adjustment either by shifting in the axial direction or in the direction of rotation. Finally also such an arrangement may, however, be employed in which the casing used for the variometer permits both an axial shift of the coil of the stator and a shift thereof in the direction of rotation with the casing at rest. To attain a simple construction of the arrangement it may be preferable to connect the casings of the various variometers mechanically in such a manner that they guide each other to be so adjusted as to attain an agreement of the inductance curves. Also this guide may be conceived in such a manner that it serves only either to adjust the variometer in the axial direction or the direction of rotation or that it permits both adjustments to be effected. The parts employed for the mutual guide may at the same time be designed according to the invention in such a manner that they serve to fix the parts shifted in the position adjusted. This may be accomplished according to the invention by providing slots in one or the parts to be guided, While the other part is provided with guide bolts preferably cap screws which pass through the slots and screwed into the other part.

In the accompanying drawing is shown an embodiment of the invention in diagrammatic form in which is shown the arrangement with two variometers mechanically coupled.

Fig. 1 is a side elevational view and Fig. 2 is a sectional view taken along the line IIII of Fig. 1.

On a base I the casing 3 of the right-hand variometer is carried by the bracket 2. To this end, the casing is provided with a threaded extension 4 which passes through a corresponding opening of the bracket 2 and a nut 5 is screwed on the threaded extension 4 to firmly secure the casing 3 to the bracket 2. The rim of the housing 3 is associated with the casing 5 of the lefthand variometer. The rim of the housing ii is provided with slots l through which screws 3 are brought into engagement with the threads provided in the housing 3. ll denotes the shaft of the set on which are mounted the rotors of the variometers. On the base I is shown also one of the above-mentioned additional inductances capable of being adjusted and which is connected in series with the coil of a variometer. This inductance consists of a container Ill of magnetizable material secured to the base I by means of a screw H and containing the coil. whose inductance is capable of being adjusted by adjusting the screw i 2. In Fig. 2, 9 denotes the shaft of the set, IS the magnetizable core of a rotor mounted on the shaft, M the coil of the rotor, IS the stator coil and it the magnetizable core of the stator. The latter is held firmly in the housing 3 by means of screws ll passing through slots l3 provided in the casing 3. By loosening the screws 8 the stator or the housing 6 and the stator with coil of the left-hand variometer, firmly secured to the casing 6 by means of the screws ll may be shifted in the direction of rotation relatively to the rotor with coil and by loosening the screws ll the stator coil or only the stator core may be shifted in the axial direction With respect to the corresponding rotor.

An arrangement in which the casings of both variometers are at rest and an adjustment is nevertheless possible by effecting a shift both in the axial direction and in the direction of rotation may be attained by providing in the individual casings such a large slot which permits a sufficient axial displacement as well as a displacement in the direction 01 rotation and by arranging under the head of the screws I! such a large washer on the shaft of the screws that it is at least in negagement with the opposite points of the slot of the casing when shifting the core of the rotor with respect to its casing in either direction.

What is claimed is:

1. In a device of the kind described, a frame, a housing comprising a pair of partially telescoped coaxial cup-like members mounted end to end and so that their respective open ends face each other, means for mounting one of said members on said frame, said other member being rotatable about its axis relative to the other member, set screw means cooperating with both of said members for holding said members in a fixed relation relative to one another, a variometer mounted within one of said members and comprising a stator and a rotor, said stator being axially adjustable within said member, a second variometer mounted within the other of said members and comprising a stator and a rotor, said last named fixed coil being axially adjustable within said last named member, said two rotors being in coaxial relationship, and an operable shaft for rotating said tWo rotors in unison.

2. The arrangement described in the next preceding claim wherein the stator coil and rotor coil of each variometer is provided with an individual core.

3. The arrangement described in claim 1 wherein an additional variometer is mounted on said frame and connected with at least one of said other variometers.

l. In a device of the kind described, a frame, a housing comprising two portions rotatable rel ative to one another, said housing being mounted on said frame, a first variometer including a rotor and a stator mounted within one of said housing portions, said stator being mounted for axial displacement within said last named portion, a second variometer including a rotor and a stator mounted within the other portion of said housing, said last named stator being mounted for axial displacement within said last named portion of the housing, means external said housing for individually adjusting said stators in an axial direction, said stators being rotatably adjustable relative to one another by rotation of one of said housing portions with respect to the other thereof, and a single means for operating said rotors in unison.

ADOLF WEIS. JOSEF BRACKMANN. 

